code: def inv_transform(self, prob_map):
      assert len(prob_map.shape) == 4 and prob_map.shape[0] % 2 == 0
      num_maps = prob_map.shape[0] // 2
      prob_map, prob_map_flipped = (
          prob_map[:num_maps],
          prob_map[num_maps:],
      )
  
      return 0.5 * (prob_map + paddle.flip(prob_map_flipped, axis=[3]))
  
file_path: PaddleSeg/EISeg/eiseg/inference/transforms/flip.py
imports: import paddle
  from inference.clicker import Click
  from .base import BaseTransform
label_desc: Use image node_id 2 for calling the AddHorizontalFlip obj's underlying member method code with example usage: obj.inv_transform(prob_map) and returns: unknown